Lecture Week 4 OSI Transport Layer Network Fundamentals.

Lecture Week 4OSI Transport Layer

Network Fundamentals

Objectives• Explain the role of Transport Layer protocols

and services in supporting communications across data networks

• Analyze the application and operation of TCP mechanisms that support reliability

• Analyze the application and operation of TCP mechanisms that support reassembly and manage data loss.

• Analyze the operation of UDP to support communicate between two processes on end devices

Transport Layer Role and Services

• Explain the purpose of the Transport layer

Transport Layer Role and Services

• Major functions of the transport layer and the role it plays in data networks

Transport Layer Role and Services

• Supporting Reliable Communication

Transport Layer Role and Services

• Identify the basic characteristics of the UDP and TCP protocols

Transport Layer Role and Services• Identify how a port number is represented

and describe the role port numbers play in the TCP and UDP protocols.

Transport Layer Role and Services• Describe the role of segments in the

transport layer and the two principle ways segments can be marked for reassembly.

Application and Operation of TCP Mechanisms

• Trace the steps that show how the TCP reliability mechanism works as part of a session

Application and Operation of TCP Mechanisms

• Describe the role of port numbers in establishing TCP sessions and directing segments to server process

Application and Operation of TCP Mechanisms

• Trace the steps in the handshake in the establishment of TCP sessions

Application and Operation of TCP Mechanisms

• Trace the steps in the handshake in the termination of TCP sessions

Managing TCP Sessions

• Describe how TCP sequence numbers are used to reconstruct the data stream with segments placed in the correct order

Managing TCP Sessions

• Trace the steps used by the TCP protocol in which sequence numbers and acknowledgement numbers are used to manage exchanges in a conversation

Managing TCP Sessions

• Describe the retransmission.remedy for lost data employed by TCP

Managing TCP Sessions

• Describe the mechanisms in TCP that manage the interrelationship between window size, data loss and congestion during a session

UDP Protocol

• Describe the characteristics of the UDP protocol and the types of communication for which it is best suited

UDP Protocol

• Describe in detail the process specified by the UDP protocol to reassemble PDUs at the destination device

UDP Protocol

• Describe how servers use port numbers to identify a specified application layer process and direct segments to the proper service or application

UDP Protocol

• Trace the steps as the UDP protocol and port numbers are utilized in client-server communication.

Summary

Thank You